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Finding the Fourth Proportional to 260.70, 391.05 and 89.70

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Solution

The fourth proportional to 260.70, 391.05 and 89.70 is: 134.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.70 : 391.05 = 89.70 : x
  2. Step 2: Convert to fraction form
    260.70/391.05 = 89.70/x
  3. Step 3: Cross multiply
    260.70x = 391.05 × 89.70
  4. Step 4: Simplify right side
    260.70x = 35,077.19
  5. Step 5: Solve for x
    x = 35,077.19/260.70
  6. Step 6: Final answer
    x = 134.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.